Beat shortening and sugar together until creamy.,Blend in eggs and vanilla.,______,Add to creamed mixture; blend well.,Stir in oats.,Chill dough several hours or overnight.,Shape to form 1-inch balls.,Place on ungreased cookie sheets, about 2 inches apart.,Bake in preheated moderate oven (375 F) 10 to 12 minutes.,Immediately place a small square of milk chocolate bar on each.,Remove cookies from cookie sheets; press pecan half into chocolate.